Floor-joist construction form



E. T McABEE. FLOOR JOlST LONSTRUCTION FORM.

APPLICATION FILED MAY 25, 1921.

Patented May 30, 1922.

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ERN ST r. McABEE, or Kansas crrr xansasi j FLOOR-JOIST consrnncrron roam To all whom'c't may concern."

Be it known that I, ERNnsT T. McAnnn, a citizen of the United States, residing at Kansas City, in the county of Wyandotte thereon, which form a part of this specifica-- tion.

My invention'relates to forms for concrete floor and joist construction and more par ticularly to an adjustable form dome for use in suchwork. a v

"The principal object of the invention is to provide a domev used in conjunction with and supported on sofiits or centering beams which may be readily adjusted to providea form for the particular needs required in any floor construction; that is,.the same domes may be used in th construction of floor beams of various depths and side angles and various spacings between the beams.-

In accomplishing these obj ectsI have provided means for quickly adjusting the domes in position and for easily collapsing them for removal' after the floor. is formed.

Other-featuresof my invention will be apparent by reference to the following de scription in connectionwith the accompany ing drawings, -wherein Fig. 1 is a perspective view of a concrete floor partially formed, showing the arrangement of domes constructed in accordance with my invention on the soffits supported by shoring.

Fig. 2 is a transverse vertical sectional view of the finished floor illustrating two of the domes, one of which is collapsed for removal.

Fig. 3 is a detail perspective view of a portion of a side section of the clome, illi1strating the latching mechanism for securing the truss which supports the top sections of the dome and the side sections together.

Fig. at is a detail perspective view of a portion of one of the trusses for supporting the top sections of the dome.

Referring more in detail to the drawings by numerals of reference: a

1 and 1 designate the opposite side sec- Specification'of Letters Patent. 7

i i Patented Biiay 3 0, 1 9 22.

Application filed May 25, i921. Serial No. 472.487. k s

tionswhichj with-the top sections 2 and 2,

co-operate to formthe wall portions 'of the dome. s trusses 3 and latching mechanism t to form a completed dome, the'details of whichare hereinafter described. a r 1 The truss for supporting and securing'the doine sections together comprises telescoping imembers' consisting of angles 5' and 6, the

and 8 of whichQoverlap one with the I legs These are secured together by the other and Secured together by olt Mid slot connections 9 and 10 respectively.

Pivoted to the outer end of the angles 5 and 6 by boltsll'jare side supporting angles and 13,'braced with respectc'tothe angles and 6 by brace bars '14 and'l5, which are secured to the lower endsofthe angles 12 'andol3 by bolts orcfastening devices 16 and to the vertical legs Hand 18 of the"supportin g angles 5 and 6 by boltand slotconnec- I tion? 19 malty at. th s ppor angles 12 and 13 may beiadjust d radi ll with respect'to the top supporting angles '5 1 and 6 Sand so thatj the sides ofthe domesmay be adjusted to change the draftof,thebeanis to be formed to support the fioor. "That is,": i

with my preferred I form, the angle which the side of the beam with the finished floor may be.changedtofsuit the conditions the braces and 15} the sidean'gles 12" and 13 pivoting on the holtconnectmns' 16. H

For secur ng the side sect ons land l of I a dl y adju a he o t in h l ts. 19 which, in effect, lengthens and" shortens? the dome togetherl provide the latchinechs u anisinheretofore mentioned, which {coin prises angles 20 and 20 secured to the side sections 1 and 1 by fastening devices 21 and spaced apart to receive a side angle 12 or truss 3, which rests on a latch bar 22 pivoted at 23 to the angle'QO' and which is retained in functionalposition by the spring latch Qt, secured to the angle 20, as illustrated.

To k y the truss to the side sections 1 and.

13 as the case may be, of the supporting I 1 to keep the sections from falling apart, I

provide the wedge pins 25 which engage openings 26 and 27 in the angles 20 and 20' and an opening 28 inthe side angle of the truss 3 so that whenthe pin 25'lS inserted, the parts are securely keyed together to prevent the forms from collapsing.

In constructing a floor of the character illustrated, the supporting soflits 29 are first spaced in parrallel'alignment at a distance a equal to the spacing of the beams 30 for" supporting the finished floor 31 and they are, supported upon shoring or posts 32 01 suflicient strength to support th finished floor until the concrete sets. 7

Vith the sofl it boards'29 so spaced and supported, the domes may be adjusted therebetween and moved into position. The domes are first adjusted for Width through the medium of the trusses by lengthening or shortening the supporting members and ad justing the telescoping angles 5 and 6. with respect to each other, which is readily permitted by their slot connections after Which the angles 12 and 13 are adjusted to provide the required draft for the beams. Then the side sections are secured together by inserting the pins 25, after which the top sections 2 and 2 of the dome are placed on the side sections as shown and the completed dome placed upon the sofiit in position. Y After all the sections are placed and the floor set, the domes are removed by knocking out the pins 25 and releasing the latches, Which permit the latch bars to drop, releasing the supporting trusses and dome sections as shown in Fig. 2.

From the foregoing it will be apparent that a simple construction is provided and that the dome may be readily adjusted and collapsed. I v What I claim and desire to secure by LettersPatent is I 1. In a dome having side sections and a top section, a longltudinally adjustable truss member for supporting the top section, and

a latch mechanism carried by the side sectionsfor supporting the'truss' member.

2. In a dome having side sections and a top section, a truss member for supporting the top section comprising telescoping members having bolt and slot connection, and a latch mechanism for securing the truss memher to the side sections.

3. In a dome having side sections and a top section, a truss member comprising telescoping members, side angles carried by the scoping members having bolt and slot connections, side anglespivotall'y hinged to the ends of the telescoping member, brace bars adjustably connecting the'side angles'to the telescoping members and means for securing the side angles to the side sections.

5. In a dome having side sections and a top section, atruss member for supporting the top section and latch mechanism comprising a latch bar retained by a latch carried by the side sections for supporting the truss memher.

6. top section, a truss member having telescoping members, sideangles carried by the telescoping members having openings therein. angles secured to the side sections having openings adapted to "register with the opening in'the side angles and a pin for engaging in said openings for securing the side sections and truss member together.

7. 'In a dome having side sections and a top'section, a truss for supporting the top section having a pin engaging Imeans,1atch mechanism carried by the side sections having pin engaging means corresponding'to the pin engaging means in the truss member, and a pin for engaging the pin engaging means for securing the side sections tothe truss member. 7 v I 8. Ina dome havingside sections and. a top section, a truss member for supporting the top sectiomtruss supporting means carried by the side sectionscomprising spaced angles secured to the side sections, alatch bar carried by one of the angles for supporting the truss and a latch carried by the other for securing the latch bar. I

In testimony whereof I afiix my signature.

ERNEST T. MQABEE.

In a dome havingside sections and a 

